The biggest problem with almost all available aftermarket systems is they don’t come in standard size but a cheap extra large size which covers half AC vents disturbing air flow and another problem is that they have mic on the left side as they are all Chinese systems which were originally for LHD cars resulting in poor BT voice clarity on phone calls. The TW system is amazing in terms of quality specially if you have to use BT and the camera is better than any aftermarket camera available.
I am pretty happy with the sound they offer with stock speakers. Most Chinese systems also have a hissing sound at higher volumes.
It depends on requirements also, my main reason for Navigation was a back camera and I listen to music also on my phone BT so don’t need any other functions.
